Enthalpy Equations Calculate energy change with thermal energy transferred q amount of work involved w E q w Calculating thermal energy transferred Q M Cs T Remember that a variable can be moved out of the equation and it can be converted into a fraction to determine the variable M2 M 1 Cs 1 T 1 Cs 2 T 2 Calorimeter Concept Remember that if the law of thermodynamics holds true then the calorimeter will absorb all of the energy lost by the system Therefore CCalorimeter T m H Combustion 0 Both the Change in HeatCombustion and the Calorimeter constant will be given Enthalpy of Formation The enthalpy of a reaction that produces 1 mol of the substance from its elements in the standard state Find the product flip the equation and then do the math to determine how many moles of the beginning substance are necessary in order to create a mol of the product Gas Laws The Ideal gas Law A gas behaves most ideally at low pressure and high temperatures PV nRT 1 1 R 0 08206 L atm mol K n PV For calculating density RT V nRT For calculating density P Combined Gas Law P1 V 1 P 2 V 2 T1 T2 Now hold pressure constant and you get Charles Law Stoichiometry reactant 1 mol of reactant equation kj Amt of limitting agent mm of limitting agent Reactant kj 1 mol of final 1 mol limitting agent V1 V2 T 1 T2